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Pipe Flowrate Measurement

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...

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Related Experiment Video

Updated: Jun 27, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Quantum Dot-Based Optical Fiber Sensor for Flow Velocity Sensing at Low Initial Temperatures.

Lei Sun¹, Yekun Cao¹, Rui Zhou¹

¹Department of Physics, School of Physics and Mechanics, Wuhan University of Technology, Wuhan 430070, China.

Sensors (Basel, Switzerland)

|April 12, 2025

Summary

A novel fiber sensor probe detects microfluidic flow velocity with minimal temperature increase. This innovation offers sensitive, low-temperature monitoring for applications like blood microcirculation and drug delivery.

Keywords:

Fabry-Perot interferometer PbS QDs flow velocity micro-flowmeter photothermal effect

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Last Updated: Jun 27, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Area of Science:

Optoelectronics
Materials Science
Microfluidics

Background:

Accurate flow velocity monitoring is vital for microfluidic systems and blood microcirculation.
Conventional hot wire flowmeters require high initial temperatures, limiting their use with temperature-sensitive fluids like blood.

Purpose of the Study:

To develop a fiber sensor probe for sensitive flow velocity detection in microfluidics.
To overcome the limitations of high initial temperatures in existing hot wire flowmeters.

Main Methods:

Fabrication of a fiber sensor probe with a plano-concave cavity using PbS quantum dots (QDs)-doped photoresist.
Utilizing a 980 nm excitation laser for thermal energy conversion and C-band interference for detection.
Implementing an intensity interrogation scheme for the fiber sensor probe.

Main Results:

Achieved sensitive flow velocity monitoring with only a 3 °C temperature increase.
Demonstrated a sensitivity of 7.7 pm/(mm/s) within a linear response range of 3.82 mm/s to 16.72 mm/s.
The proposed sensor is suitable for microfluidics due to its low initial temperature requirement.

Conclusions:

The developed fiber sensor probe offers a sensitive and low-temperature solution for microfluidic flow velocity measurement.
This technology shows significant potential for applications in microcirculation monitoring and drug delivery systems.